Research crawlers collect pages for university and non-profit studies of the web.
Most are low volume and respect robots.txt. Block them there if you prefer not to take part.
Of the 1 academic research crawlers with a stated policy, 1 follow robots.txt and 0 do not. Bots that ignore robots.txt can only be stopped by user agent or IP at your server, CDN or WAF.
Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.
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